The Tengu is a light ship due to being constructed entirely of mahogany. Not just any mahogany, but mahogany from the planet of Malchior 7 where the trees grow 300 ft tall and breathe fire. It was from these trees that ship was forged 2000 years ago, using ancient blood rituals of the Malchior people. Not only does it make it nigh impossible to outrun, but it can bend the very fabric of the universe to give itself that smaller sig radius. Also it's a very fine material. Fairly expensive. Mahogany.